Crank for lifting jacks



June 23, 1925.

' A. (.2' HOPKINS CRANK FOR LIFTING JACKS Filed Aug, 16, 1924 .M m n HT. A HI U l. HI G Fatentcd June 23, 1925.

1,543,332 UNITED STATES PATENT OFFICE.Q

Anrnuno. HOPKINS, or nrnns, MICHIGAN, AssIGNoR T NATIONAL STANDARD COM- 1 ra ny, or NILEs,*'MIcHIGAN.'

CRANK FOR LIFIING JACKS.

Application filed August 16, 1 9 24.. Serial no. 732,5 sop To all whom it may concern Be it known that I, ARTHUR C. HorKINs, a citizen of the United States, residing at Niles, county of Berrien, State of Michigan, have invented certain new and useful Improvements in Cranks for Lifting Jacks, of which the following is a specification.

This invention relates to improvements in cranks for lifting jacks.

The main object of this invention is to provide an improved crank for lifting jacks which may be collapsed into a comparatively compact form and one which, when extended for use is quite rigid and does not collapse.

Objects pertaining to details and economies of my invention will definitely appear from the detailed description to follow.

I accomplish the objects of my invention by the devices and means described in the following specification. The invention is clearly defined and pointed out in the claims.

A structure which is a preferred embodiment of my invention is clearly illustrated in the accompanying drawing forming a part of this application, in which:

Fig. I is a side view of a lifting jack equipped with my improved crank.

Fig. II is a plan view of the crank collapsed.

Fig. III is a transverse section on a line corresponding to line 33 of Fig. II.

Fig. IV is an enlarged transverse section on a line corresponding to .line 4-4 of Fig. II.

In the drawing the sectional views are taken looking in the direction of the little arrows at the ends of the section lines and similar numerals of reference indicate similar partsin all of the views.

Referring to the drawing, the ack designated generally by the numeral 1 is of the type illustrated in my application for patentfiled June 28, 1924:, Serial No. 722,938. This jack is provided with a driving gear 2 having a socket 3 adapted to receive the shank.

My improved crank comprises an inner section 4- of rectangular cross. section. This section is provided with stops 5 and 6 adjacent its ends, the stop 6 being spaced from the inner end of the section 1 providing a tang portion 7 adapted to enter the socket 3. The outer section 8 is of circular crosssection and has a slide 9 rigidly SQGLlL'ed thereto by the rivets 10 to slidingly embracethe section 4 between the stops 5 and 6 so that the sections may be telescoped or collapsed together as shown'inFig. II or extended as shown in Fig. I. The outer section 8 has an offset 11 therein providing a crank, the outer arm 12 of this ofiset being extended transversely of the shaft sections of the crank and terminating in a grip or crank 13 disposed in a plane parallel to the longitudinal plane of the shaft, thus'providing two cranks or grips.

To permit the complete collapsing of the sections the part 12 is bent as shown in Fig. III so that it may. telescope or slide over the section 4. This permits of the extension of the-crank to its full length as shown in Fig. I, or the partial extension thereof for use, as may be desired. When extended for use the crank cannot collapse as is likely to occur with cranks having hinged joints; at the same time, the structure is readily extended or collapsed, and, when collapsed is quite compact.

Having thus described my invention what I claim as new and desire to secure by Letters Patent is:

1. A crank of the class described comprising an inner shaft section of rectangular crosssection provided with stop lugs adjacent its ends, an outer shaft section of circular cross section disposed at the side of said inner section, and a slide secured to the inner end of said outer section to slidably embrace said inner sections between said stops, the outer end of said outer section having an offset therein providing a crank, the outer arm of said offset being extended beyond-the plane of the said shaft and turned outwardly to provide a second crank, the said arm beingbent longitudinally permitting it to slide over the said inner section when the outer section is telescoped therewith.

2.'A crank of the class described com-- prising an inner shaft section of rectangular cross section provided with stop lugs adjacent its ends,- an outer shaft section of circular cross section disposed at the side of said inner section, and a slide secured to the inner end of said outer section to slidably embrace said inner sect-ioirbetween said stops, the outer end of said outer section having an ofiset therein providing a crank, the outer arm of said ofisetbeing extended beyond the plane of the said shaft and turned outwardly to provide a second crank.

3. A crank of the class described comprising an inner shaft section, and an outer shaft sect-ion disposed at the side of said inner section and slidably secured thereto, the outer end of said outer section having an oflset therein providing a: crank, the outer arm of said oii'set being extended beyond the plane of the said shaft and turned outwardly to provide a second crank, the said outer arm being bent longitudinally to permit it toslide over the said inner section when the outer section is telescoped therewith.

In Witness whereof I have hereunto set my hand.

ARTHUR G. HOPKINS. 

